NAME

exp, log, log10, pow − exponential, logarithm, power

SYNOPSIS

#include <math.h>

double exp(x)
double x;

double expm1(x)
double x;

double log(x)
double x;

double log10(x)
double x;

double log1p(x)
double x;

double pow(x, y)
double x, y;

DESCRIPTION

Exp returns the exponential function of x. 

Expm1 returns exp(x)-1 accurately even for tiny x. 

Log returns the natural logarithm of x.

Log10 returns the base 10 logarithm. 

Log1p returns log(1+x) accurately even for tiny x;

Pow returns xy. 

SEE ALSO

hypot(3M), sinh(3M), intro(2)

DIAGNOSTICS

These functions handle exceptional arguments in the spirit of IEEE standard P754 for binary floating point arithmetic.  Log(x) for x < 0, log10(x) for x < 0, pow(0.0,0.0), pow(infinity,0.0), and pow(1.0,infinity) are invalid, as is pow(x,y) if x < 0 and y is not an integer value or infinite value; in all these cases NaN function values are returned and errno is set to EDOM. 

Sun Release 3.2  —  Last change: 14 March 1986